/*
 * Copyright 2012-2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.nicoll.boot.daemon;

import java.io.IOException;

import javax.management.InstanceNotFoundException;
import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;

import org.springframework.boot.SpringApplication;
import org.springframework.util.ClassUtils;

/**
 * Basic daemon implementation for a Spring Boot app.
 *
 * @author Stephane Nicoll
 */
public class SpringBootService {

	public void start(String[] args) throws Exception {
		if (args.length == 0) {
			throw new IllegalStateException("Spring Boot application class must be provided.");
		}
		Class<?> springBootApp = ClassUtils.resolveClassName(args[0],
				SpringBootService.class.getClassLoader());
		System.out.println("Starting Spring Boot application [" + springBootApp.getName() + "]");
		SpringApplication.run(springBootApp);
	}

	public void stop(String[] args) throws IOException {
		System.out.println("Stopping Spring Boot application...");
		int jmxPort = Integer.parseInt(args[0]);
		String jmxName = SpringApplicationAdminClient.DEFAULT_OBJECT_NAME;
		JMXConnector connector = SpringApplicationAdminClient.connect(jmxPort);
		try {
			MBeanServerConnection connection = connector.getMBeanServerConnection();
			try {
				new SpringApplicationAdminClient(connection, jmxName).stop();
			}
			catch (InstanceNotFoundException ex) {
				throw new IllegalStateException("Spring application lifecycle JMX bean not " +
						"found, could not stop application gracefully", ex);
			}
		}
		finally {
			connector.close();
		}
	}

}